image overlap message for exposure 2 of trigger 903845
uvot_overlap.pl vrs. 2010-12-20b fem started at 190515d19h53m56s749489usUT
The observation of trigger 903845 started 2019-05-15T16:09:49.3
Examining file ./903845_g327_uvot_sky_image.fits
The exposure ID is 579629389
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (98.8469,52.3150) with a roll angle of 245.4
It is square with sides of 2.68 arc min. for an area of 7.17 sq arc min
The BAT error circle is centered at (98.8400,52.2950) with a radius of 3.000 arc min
This is 1.227 arc min from the center of the uvot region
The area of the BAT error circle is 28.27 sq. arc min
The UVOT/BAT overlap is 7.17 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (98.8477,52.3166) with a radius of 0.038 arc min
This is 0.102 arc min from the center of the uvot region
The area of the XRT error circle is 0.005 sq. arc min
The UVOT/XRT overlap is 0.005 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 903845
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190515d19h54m09s397388usUT
Observation start time is 2019-05-15T16:09:49.3
Examining file ./903845_g327_uvot_catalog_image.fits
The exposure ID is 579629389
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 11 detected source(s) for 903845_g327
Aspect correction adds -0.00114 degrees (-0.273 sec of time = -2.51 arc sec) to RA
Aspect correction adds -0.00073 degrees (-2.63 arcsec) to Dec
Total aspect correction is 3.63 arcsec
Star catalogs centered at 98.8509 , 52.3153 with radius 2.63 arc min.
n_usno: 99 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 10 matched entries is 0.442" for 903845_g327
Mean and std. dev of mag. difference (MAG_DELTA) are 0.958 and 0.477 for 903845_g327
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 903845_g327.
Acceptable entries have no ID, XRT distances < 5.75", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
Magnitude criteria will be applied later.
BAT distances are from RA=98.8400 (06:35:21.60) DEC=52.2950 (+52:17:42.0)
XRT distances are from RA=98.8477 (06:35:23.45) DEC=52.3166 (+52:18:59.9)
-----------------
Entry 3 in the list of sources is a candidate afterglow for 903845_g327 with genie
ra=98.87049 (06:35:28.92) dec=52.32451 (+52:19:28.2) +/- 0.6" mag=15.51+/-0.14
dist=57.6 REFID=4 major=1.1 minor=1.0 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 125.6 arc sec from the BAT position.
Found 3 entries in star catalog(s) within 20.0" of the candidate.
printing all entries
(Entries within 2 arc sec of a source list entry are considered a match)
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
98.8719 52.3214 11.7 -1 USNO-B1 21.05 99.99 99.99
98.8703 52.3247 0.8 -1 USNO-B1 15.59 16.73 16.22 *
98.8761 52.3262 13.7 -1 USNO-B1 19.94 17.59 18.64
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 31642.904 counts in the bkg source region of 6031.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 5.247 counts/pixel (5-sig UL in 4" is 19.56 mag) for 903845_g327
There are 1041.2841 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 5.233 counts/pixel for 903845_g327
There are 6436.1006 counts in the xrt_bkg source region of 1232.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 5.224 counts/pixel (5-sig UL in 4" is 19.57 mag) for 903845_g327
There are no candidates inside BAT error circle, but outside XRT error circle.
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 20.12, XRT distances < 5.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 903845_579629389_190515d19h54m09s397388usUT_bkg.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(98.8469,52.3150,45")
fk5;-circle(98.8458467514144,52.3138360937703,6")
fk5;-circle(98.8458896596508,52.3062068777367,6")
fk5;-circle(98.839276376249,52.3033143391434,6")
Region file: 903845_579629389_190515d19h54m09s397388usUT_xrt.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(98.84771,52.31664,8")
Region file: 903845_579629389_190515d19h54m09s397388usUT_xrt_bkg.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(98.84771,52.31664,25")
fk5;-circle(98.84771,52.31664,15")
fk5;-circle(98.8458467514144,52.3138360937703,6")
image paragraph message for exposure 2 of trigger 903845
------ Start for Possible Stand-alone Circular ----
In response to GRB190515 (Swift/BAT trigger 903845) at 16:04:21 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
305 seconds after the BAT trigger. No credible afterglow candidate has been
found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the
XRT error circle. The typical 3-sigma upper limit has been about 19.2 mag. The
8'x8' region for the list of sources generated on-board covers 100% of the XRT
error circle. The list of sources is typically complete to about 18.0 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.09.
------- notes for trigger 903845 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190515d19h54m13s036607usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=903845
-expid=579629389 -meonly -msg_image
Results from standard processing of UVOT TDRSS data for this trigger should be
available at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/903845/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
XRT position found for srclist. XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 579629389.30218 or about 2019:135:16:09:44 UT
Found 479 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 9% of the srclist region. Found 45 sources in
srclist catalog. Found 1 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
18.12 mag.
Found 11 source(s) in Genie image catalog. Found 1 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.12 mag. Found 95 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
9% of the Genie image region.
Genie image analysis:
Found 31642.9 counts in the large background region of 6031.0 pixels or a rate
of 5.247 counts/pixel in a radius of 45.0 arcsec. Based on this background, the
typical 5-sigma UL at a random point in the Genie image is 19.60 mag. for a
4-arcsec aperture.
Found 1041.3 counts in the XRT position region of 199.0 pixels or a rate of
5.233 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.007 +/- 0.139 (1-sigma) cps or
23.80 mag and a range from 20.47 to 99.99 mag. The 3-sigma UL at the XRT
position is 0.424 cps or 19.31 mag. The closest srclist source has ra= 98.8457
dec= 52.3140 mag=17.62 sep=10.63". The closest Genie source has ra= 98.8458
dec= 52.3138 mag=17.20 sep=10.90".
All AG candidates sorted by magnitude for the current finding chart.
(U/V/White SRCLIST mags < 17.5/17.5/18.5 are reliable. Mag > 18.5/18.5/19.5 are
not. Others are uncertain.)
(U/V/White Genie image mags < 18.0/18.0/19.0 are reliable. Mag > 19.0/19.0/20.0
are not. Others are uncertain.)
(Magnitudes followed by * have been corrected for exposure.)
---MET--- -dt- filter ---RA-- ---DEC--- -MAG/Limit Dist(") Source Asp.Corr?
579629389 304 U srclist found no candidates.
579629389 304 U image found no candidates.
List afterglow candidates for other finding charts.
579629176 91 WHITE srclist found no candidates.
579629176 91 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 52.31664
GRB_ERROR: 5.75
GRB_RA: 98.84771
IMAGE_START_TIME: 16:09:44
MAGNITUDE: 19.3
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT